Colour Venn was designed with Mark Champkins. With Colour Venn Mark wanted to explore the subtractive colour model which is the basis of printed colour:

"Cyan, Magenta and Yellow are the keys to recreating ANY colour on the printed page. Every shade and hue of colour in newspapers, magazines and printed material will be only ever be made up of a combination of CMYK - cyan, magenta, yellow and “key” (which is black) ink.

This is known as the “Subtractive Colour Model” as the four colours of ink “subtract” from the brightness of the white surface beneath.

Colour Venn uses Venn diagram style circles of colour cyan, magenta and yellow films with different diameters corresponding to the second, minute and hours. As each moves around, a continuously intersecting pattern of colour emerges, unique at every moment of the day".